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Research & Technology News
Wavelength Converter Features Three-Wave Mixing Inside a Pump Laser
Sep 1, 2003 — A research group at McMaster University in Hamilton, Ontario, Canada, has proposed and demonstrated an intracavity approach to wavelength conversion for optical telecommunications networks that eliminates the need for high-power, tunable pump lasers. The ability to convert radiation from one wavelength division multiplexing channel to another would greatly enhance the flexibility of networks. To this end, some researchers have investigated gain saturation in a semiconductor optical...
All-Fiber, Q-Switched Laser Generates 1.8 mW
Aug 1, 2003 — A team of scientists at the University of Science and Technology of China in Hefei has designed and demonstrated an all-fiber, Q-switched laser. High-power, single-frequency oscillation is obtained with a ring resonator, which eliminates the...
Co-Doping Drives 2-µm Fiber Laser
Aug 1, 2003 — A group of scientists at the University of Sydney in Australia has demonstrated the use of ytterbium as a sensitizer in a holmium-doped fiber laser. Although Yb3+-Ho3+ sensitizing-lasing systems have been explored in crystalline YAG hosts, the...
External Cavity Controls Transverse Mode in VCSEL
Aug 1, 2003 — The fundamental transverse mode of a vertical-cavity surface-emitting laser (VCSEL) produces a high-quality Gaussian beam, as it does with any laser. As the bias current of the device is increased, however, higher-order transverse modes often begin...
Femtosecond Pulses Write Fiber Bragg Gratings
Aug 1, 2003 — A group at the Communications Research Centre Canada in Ottawa has presented an alternative means of writing fiber Bragg gratings that uses femtosecond pulses of 800-nm radiation from a Ti:sapphire laser. The advantage of such an approach, according...
In Search of the Dipole Moment
Aug 1, 2003 — Turning quantum dots on and off sounds as simple as flipping a switch, but it can't be accomplished until we understand how much excitation is required to complete the task. There has been a lot of confusion in the literature, according to Kevin L....
Lasers and Chemical Etch Make Tiny Holes in Glas
Aug 1, 2003 — Scientists at the Natural Research and National Research councils, both in Ottawa, have shown that femtosecond laser pulses, together with a chemical etching process, can be used to fabricate periodic microstructures in glass. They think that the...
Microlaser-Pumped Optical Parametric Generator Is Small, Tunable IR Source
Aug 1, 2003 — Just as a high-gain laser can function in a superradiant mode -- i.e., without a resonator -- a high-gain optical parametric oscillator can forgo its resonator and still operate effectively. In such a case, the device is called an optical parametric...
Optical Switch Uses Thin Film and Mirror
Aug 1, 2003 — Sarun Sumriddetchkajorn and Khunat Chaitavon of Thailand's National Science and Technology Development Agency and Ministry of Science and Technology, both in Pathumthani, have developed a novel concept for a 2 x 2 optical switch. The device...
Origin of 'Fiber Fuse' Is Revealed
Aug 1, 2003 — In the argot of fiber optics engineers, a "fiber fuse" occurs when a fiber, overloaded with optical power, fails catastrophically. Several mechanisms have been suggested to explain the phenomenon, but now a team from OFS Research Laboratories in...
Photonic Crystal Device Demonstrates Design Rules
Aug 1, 2003 — Although research laboratories around the world have studied photonic crystals intensively, few efficient photonic devices have been built from the structures. Scientists at Kyoto University in Japan report that this is due largely to a lack of...
Q-Switched Ho:YAG Laser Produces 50-mJ Pulses
Aug 1, 2003 — Eye-safe pulsed lasers operating in the 2-µm spectral region are useful in ranging, remote sensing and laser radar applications. Moreover, if they have high peak powers, their outputs can be efficiently converted in optical parametric oscillators...
Researchers Demonstrate Mode-Locked Fiber Laser
Aug 1, 2003 — A fiber laser capable of producing a train of picosecond, wavelength-tunable pulses at gigahertz frequencies would be a useful source for wavelength division multiplexing telecommunications and could find application in fiber-sensor systems and...
Terahertz Probes Reveal Excitonic Enhancement
Aug 1, 2003 — While terahertz technology hovers between the fields of high-frequency electronics and photonics, researchers from Lawrence Berkeley National Laboratory in Berkeley, Calif., recently pushed its limits to study transient conducting and insulating...
Compensating Thermal Effects in Rod Lasers
Jul 1, 2003 — By forcing an Nd:YAG laser to operate in radial or azimuthal polarization, a team at Soreq Nuclear Research Center in Yavne, Israel, has overcome the thermally induced beam-quality aberrations commonly associated with solid-state rod lasers. The...
Digital Holography Used in Watermarking 3-D Object
Jul 1, 2003 — In this age of tightened security, researchers at the University of Connecticut in Storrs have discovered what may someday prove to be a useful method of hiding one piece of information inside another. Using a watermarking method, a 3-D object is...
Eliminating Beat Noise in Ring Lasers
Jul 1, 2003 — Single-frequency ring lasers utilizing erbium-doped fiber amplifiers as the gain medium are attractive in a number of applications, from optical sensors to telecommunications. A serious barrier to their adoption into these technologies, however, is...
Fiber Laser Pumps Fiber Lasers for Telecommunications Applications
Jul 1, 2003 — A coalition of British and Russian telecom engineers has developed a fiber laser system that may boost performance and cut costs when substituted for the traditional diode laser transmitters in wavelength division multiplexing (WDM) networks. The...
Microscopy Probes Electron Behavior in Lasers
Jul 1, 2003 — Using variants of atomic force microscopy, a group of scientists from the University of Toronto and from Nortel Networks Optical Components in Ottawa has directly investigated the electronic characteristics of a semiconductor laser in operation. The...
Nd:BaYF Laser Produces 2.4 W
Jul 1, 2003 — Lasers based on BaY2F8 (BaYF) have the potential to compete with other neodymium-doped solid-state devices for moderate-power, near-IR applications, a team of scientists in Italy has reported. In recent experiments, the group, which included members...
Novel Chromatic Dispersion Compensation
Jul 1, 2003 — A collaboration between researchers at OFS and Bell labs of Murray Hill and Holmdel, N.J., respectively, has produced a novel system for tunable fiber optic dispersion compensation that is effective with any wavelength division multiplexing (WDM)...
Photonics Examines Brake Noise
Jul 1, 2003 — Most automotive brake noise is little more than an annoyance. But as advances in technology and design have made vehicles quieter, customers have a lower tolerance for these squeals, groans and moans, and the automotive industry is pressed all the...
Shocked Photonic Crystals Tune Light
Jul 1, 2003 — In a series of "numerical experiments," researchers at Massachusetts Institute of Technology in Cambridge have discovered novel frequency-shifting and bandwidth-narrowing phenomena that occur when light interacts with a shock wave in a photonic...
Spectrometer Uses Micromachined Grating
Jul 1, 2003 — In the pursuit of compact spectrometers for a variety of industrial applications, researchers at Fraunhofer Institut für Photonische Mikrosysteme in Dresden, Germany, have developed a device based on a micromechanical scanning grating. They suggest...
Systems Compensate for Polarization Mode Dispersion
Jul 1, 2003 — Dispersion, particularly polarization mode dispersion, becomes increasingly problematic at higher fiber optic data rates because the resulting signal distortion scales as the square of the data rate. Although there are several techniques to...
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July 2024
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